Rumors of Windows Blue—Microsoft's push for a routine, yearly upgrade cycle—have been lurking…
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You'll come away disappointed if you were hoping for a radical departure from Windows 8. In fact, it's probably better to think of this as a Windows 8 service pack than a new OS. You'll be able to choose from some new Live Tile arrangements and color schemes, as well as a Snap View for running two apps side by side. The most noteworthy addition is the built-in Internet Explorer 11 browser, but it's not yet clear what changes are present.

If you want to try installing it yourself, the leak is referred to as "Build 9364," and it's making the rounds on most file sharing sites. Otherwise, you can find a ton of screenshots on the French Polish Winforum site linked below.